Abstract:
:Fluoride is a potent therapeutic agent that increases spinal bone density in osteoporotic subjects. Based on work with animal cells previously, we proposed fluoride acts by inhibiting phosphotyrosyl protein phosphatase (EC 3.1.3.48) activity in bone cells. The presence of fluoride sensitive acid phosphatase (EC 3.1.3.2) activity was characterized in extracts of cultured human bone cells. Crude extracts contained acid phosphatase activity that was inhibited by fluoride with an apparent Ki of 12 mumol/L. The activity was investigated further by separating the acid phosphatase isoenzymes using CM Sepharose chromatography and a gradient of acetate pH 4.8-6.5. The major peak of activity recovered from CM Sepharose chromatography was characterized for stability, Km and inhibition by fluoride. The enzyme was sensitive to inhibition by tartrate, had a high affinity for paranitrophenylphosphate (apparent Km = 0.158 mupmol/L) and an apparent pH optimum of 4.8. Fluoride was a strong competitive inhibitor with an apparent Ki of 12.4 mumol/L. The column fractions containing the acid phosphatase were tested further for phosphotyrosyl protein phosphatase activity using [32P]labeled phosphotyrosyl histone as the substrate. Release of [32P]phosphate from this substrate at pH 7.0 was proportional to enzyme concentration and incubation time, demonstrating the presence of phosphotyrosyl protein phosphatase activity. The phosphotyrosyl protein phosphatase activity was inhibited by fluoride and had a pH optimum of approximately 7. These observations indicate that human osteoblasts contain a fluoride-sensitive phosphotyrosyl protein phosphatase. Thus, these results are consistent with the hypothesis that fluoride stimulates human bone cell proliferation by inhibiting the action of phosphotyrosyl protein phosphatase, thereby increasing the level of phosphorylated tyrosine residues which are known to play a role in increasing cell proliferation.
journal_name
Clin Biochemjournal_title
Clinical biochemistryauthors
Wergedal JE,Lau KHdoi
10.1016/0009-9120(92)80045-isubject
Has Abstractpub_date
1992-02-01 00:00:00pages
47-53issue
1eissn
0009-9120issn
1873-2933pii
0009-9120(92)80045-Ijournal_volume
25pub_type
杂志文章abstract:OBJECTIVE:To evaluate if peak characteristics, the retention time, and percentage of total hemoglobin of an unknown peak on the Bio-Rad VARIANT II Hb A1c method may be used to establish a tentative identification of hemoglobin variants. METHOD:The peak characteristics, retention time, and percentage of total hemoglobi...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2004.11.004
更新日期:2005-03-01 00:00:00
abstract:OBJECTIVES:Investigate the interference of Virox® disinfectant wipes containing hydrogen peroxide with Lifescan SureStep Flexx® glucose meter results. DESIGN AND METHODS:Glucose measurements of control and whole blood samples were performed before and after cleaning with Virox® wipes to reveal the kinetics of this int...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2010.09.012
更新日期:2010-12-01 00:00:00
abstract::Preparation of (14C) Pro labeled protocollagen and requirements for its hydroxylation by PPH was investigated. Protocollagen can be prepared by centrifugation of the biological material at 15.000 X g. Substances in current use, viz catalase, bovine serum albumin and dithiothreitol were found unnecessary under the hydr...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/s0009-9120(76)80072-0
更新日期:1976-12-01 00:00:00
abstract:UNLABELLED:Frozen biospecimens are crucial for translational research and contain well-preserved nucleic acids and protein. However, the risks of freezer failure as well as space, cost, and environmental concerns of frozen biospecimens are substantial. OBJECTIVE:The purpose of the study was to review the current statu...
journal_title:Clinical biochemistry
pub_type: 杂志文章,评审
doi:10.1016/j.clinbiochem.2013.12.011
更新日期:2014-03-01 00:00:00
abstract::Rheumatoid factors (RFs) have been studied for over 50 years and are probably the most written about of any antibody. Nevertheless, the etiology of these RFs and the precise role they play in the pathogenesis of rheumatoid arthritis (RA) and juvenile rheumatoid arthritis (JRA) remain a major interest. When RFs partici...
journal_title:Clinical biochemistry
pub_type: 杂志文章,评审
doi:10.1016/0009-9120(93)90032-2
更新日期:1993-04-01 00:00:00
abstract:OBJECTIVES:Preeclampsia, the most common pregnancy-associated pathological syndrome, is accompanied by significant remodelling of the extracellular matrix and alteration in lipid composition of the umbilical cord artery (UCA). DESIGN AND METHODS:We evaluate the sphingolipid composition of UCA and its alteration in pre...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2009.07.011
更新日期:2009-11-01 00:00:00
abstract::A commercially available assay (Sigma) for urinary oxalates based on the oxalate oxidase/peroxidase catalyzed reaction produced, in our hands, recoveries of added oxalate that varied from patient to patient. A modification of the assay is reported that involves the chromatographic separation of interfering substances,...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/0009-9120(90)80032-e
更新日期:1990-04-01 00:00:00
abstract::Increased hemoglobin A1 (HbA1) occurs in diabetes mellitus as a direct consequence of hyperglycemia, which causes postsynthetic modification of hemoglobin proportional to blood glucose concentration. Glycosylation of hemoglobin is demonstrable also in vitro, not only by glucose, but with other reducing sugars such as ...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/s0009-9120(82)90556-2
更新日期:1982-06-01 00:00:00
abstract::Iodine deficiency (ID) is associated with increased prevalence of goiter, increased risk for neurodevelopmental disorders, and is the world's leading cause of intellectual deficits. Iodine nutritional status of a population is assessed by measurements of urinary iodine concentrations which are also used to define, ind...
journal_title:Clinical biochemistry
pub_type: 杂志文章,评审
doi:10.1016/s0009-9120(02)00406-x
更新日期:2002-11-01 00:00:00
abstract:OBJECTIVES:Non-invasive prenatal aneuploidy testing (NIPT) by next-generation sequencing of circulating cell-free DNA in maternal plasma relies on chromosomal ratio (chrratio) measurements to detect aneuploid values that depart from euploid ratios. Diagnostic performances are known to depend on the fraction of fetal DN...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2018.06.015
更新日期:2018-09-01 00:00:00
abstract:OBJECTIVES:To evaluate the evidence concerning gFOBT kits and to develop gFOBT standards to be implemented by the Ontario Colorectal Cancer (CRC) Screening Program (the "Program"). DESIGN AND METHODS:We evaluated 3 aspects of gFOBT kits: 1) performance factors; 2) usability factors; and 3) laboratory factors. We obtai...
journal_title:Clinical biochemistry
pub_type: 杂志文章,meta分析
doi:10.1016/j.clinbiochem.2008.08.069
更新日期:2008-11-01 00:00:00
abstract:OBJECTIVES:The current study aimed at the rapid identification of the copy number of α-globin genes for the diagnosis of α-thalassemia. DESIGN AND METHODS:To identify the copy number of α-globin genes in α-thalassemia, we developed a novel method using a multiplex polymerase chain reaction (PCR) in combination with th...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2012.02.006
更新日期:2012-07-01 00:00:00
abstract:BACKGROUND:The accurate early diagnosis of acute kidney injury (AKI) in patients with acute heart failure (AHF) is an unmet clinical need. Cystatin C might improve the early detection of AKI. METHODS:207 patients presenting to the emergency department with AHF were enrolled. Cystatin C was measured in plasma in a blin...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2017.07.016
更新日期:2017-12-01 00:00:00
abstract::Autosomal dominant olivopontocerebellar degeneration was evaluated in a family numbering 414 living members. Urine samples were obtained from 5 affected and 5 unaffected not at-risk family members after 4 days on a synthetic diet. 159 urine vapor constituents were measured by gas-liquid and ion-exchange chromatography...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/s0009-9120(75)93752-2
更新日期:1975-12-01 00:00:00
abstract::Fucosidosis is an inherited lysosomal storage disease due to a deficiency of alpha-L-fucosidase activity. Exponentially growing lymphoid cell cultures from a fucosidosis patient (JH) had 16-fold lower extracellular alpha-L-fucosidase protein and 72-fold lower intracellular alpha-L-fucosidase protein with negligible ca...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/0009-9120(91)80018-x
更新日期:1991-06-01 00:00:00
abstract:BACKGROUND:Cardiac troponins (cTn) are essential in the diagnostic assessment of non-ST-segment-elevation acute coronary syndrome (NSTE-ACS). Elevated concentrations of cTnT and cTnI predict cardiovascular events in non-acute settings, but the individual troponin isotype association with long-term mortality in patients...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2019.12.016
更新日期:2020-04-01 00:00:00
abstract:OBJECTIVES:The aim of the study was to evaluate the concentration of interleukin 12 (IL-12), the activity of phospholipase A(2) (PLA(2)), and platelet-activating factor acetylhydrolase (PAF-AH) in type 1 diabetes (DM1) patients treated with intensive insulin therapy. DESIGN AND METHODS:Studied parameters were measured...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2009.07.023
更新日期:2009-11-01 00:00:00
abstract:OBJECTIVES:To investigate whether the STK15 mRNA expression correlates with clinicopathologic features and the prognosis of HCC patients. DESIGN AND METHODS:Three hepatoma cell lines, two normal liver epithelial cell lines, hepatoma tissues, adjacent tumor tissues and normal liver tissues were obtained from 46 HCC pat...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2009.01.023
更新日期:2009-05-01 00:00:00
abstract:OBJECTIVES:Concentrations of troponin measured with high sensitivity troponin assays are raised in a number of emergency department (ED) patients; however many are not diagnosed with acute myocardial infarction (AMI). Clinical comparisons between the early use (2h after presentation) of high sensitivity cardiac troponi...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2013.11.019
更新日期:2014-04-01 00:00:00
abstract:OBJECTIVES:Humoral immune response to SARS-CoV-2 infection has been reported in several patient cohorts with results that vary by method and population studied due to the lack of reliable commercial assays available as the pandemic initially spread. We sought to clinically assess commercial prototype SARS-CoV-2 IgG and...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2020.08.008
更新日期:2020-12-01 00:00:00
abstract::We present data comparing the Roche CEA radioimmunoassay (RIA) utilizing ultrafiltration and the Abbott CEA immunoradiometric assay (IRMA) methods for standard curve sensitivity, analytical reproducibility, recovery (pre and post extraction), dilution linearity, and patient correlation. The Roche intra- and inter-assa...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/s0009-9120(82)97007-2
更新日期:1982-10-01 00:00:00
abstract:OBJECTIVES:To insure commutability (equivalence) between whole blood and plasma glucose values and to assess potential interferences in glucose oxidase methods. DESIGN AND METHODS:We compared plasma glucose results by the Ektachem 700 analyzer to glucose results on whole blood by the Nova Stat Profile 6, and by the YS...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/0009-9120(95)02010-1
更新日期:1996-02-01 00:00:00
abstract::Our studies lead us to suggest that in order for an organic chemical to cause porphyrin accumulation in chick embryo hepatocyte culture, it must be: 1. lipophilic; 2. resistant to biotransformation by phase I or phase II reactions to compounds which are devoid of biological activity; and 3. capable of interacting with...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/s0009-9120(89)80073-6
更新日期:1989-06-01 00:00:00
abstract:OBJECTIVE:To quantify pepsinogen C (PEPC) and prostaglandin D synthase (PGDS) in breast cyst fluid and examine if these two parameters can be used for breast cyst type classification. DESIGN AND METHODS:We quantified PEPC and PGDS in 92 and 50 breast cyst fluids, respectively, using previously established immunofluoro...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/s0009-9120(98)00079-4
更新日期:1999-02-01 00:00:00
abstract::A method is described for the determination of low plasma levels of adenosine-5'-diphosphate (ADP) using a Dupont Biometer to measure luminescence produced by the luciferin-luciferase reaction. Endogenous ATP is removed by incubation with luciferase. The remaining ADP is then quantitated, following its conversion to A...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/s0009-9120(78)80027-7
更新日期:1978-10-01 00:00:00
abstract::An automated biotin-streptavidin procedure for measuring progesterone in serum is described. The method is linear up to 98.3 nmol/L and the calibration curve is stable for at least 14 days. The lower limit of progesterone detection is 0.70 nmol/L. Although serum is the preferred specimen, progesterone levels can be me...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/0009-9120(92)90105-2
更新日期:1992-12-01 00:00:00
abstract:OBJECTIVES:Pseudoxanthoma elasticum (PXE) is a hereditary disorder predominantly affecting the skin, retina and vascular system. The aim of this study was to measure cell adhesion molecules in PXE patients. DESIGN AND METHODS:Soluble P-, E- and L-selectins were measured in 61 non-consanguineous PXE patients. The distr...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2007.12.009
更新日期:2008-04-01 00:00:00
abstract::Increasing interest in the use of tumor markers in the clinical management of cancer patients has encouraged development of guidelines by local, national and international groups. Such guidelines generally include recommendations about which markers are likely to be most helpful in given circumstances. Particular requ...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/s0009-9120(01)00199-0
更新日期:2001-07-01 00:00:00
abstract:OBJECTIVE:To identify independent predictors of serum butyrylcholinesterase (BuChE) activity and examine its relationship with the metabolic syndrome. DESIGN AND METHODS:Serum BuChE activity was measured and metabolic syndrome risk factors were assessed in 1097 healthy subjects recruited from the Newfoundland adult po...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2005.04.008
更新日期:2005-09-01 00:00:00
abstract:BACKGROUND:Automatic photometric determination of the hemolysis index (HI) on serum and plasma samples is central to detect potential interferences of in vitro hemolysis on laboratory tests. When HI is above an established cut-off for interference, results may suffer from a significant bias and undermine clinical relia...
journal_title:Clinical biochemistry
pub_type: 杂志文章
doi:10.1016/j.clinbiochem.2018.01.009
更新日期:2018-07-01 00:00:00